Powder coating primer MT-Active EL193N
WA：+86 132 6275 2056
WEB: std-coatings.com
Product Overview
MT-Active is a powder coating primer, totally free from Zinc. It is designed to give enhanced corrosion protection of mild steel and is an epoxy-polyester primer including active anticorrosive pigments. The addition of these pigments provides a steel passivation effect to protect the substrate enhancing the performance when compared to other non-active systems.
Powder Properties
| Chemical type | Thermosetting epoxy-polyester |
| Appearance | Smooth |
| Gloss level (60°) | 50-60 units |
| Color | Grey |
| Recommended Film Thickness (µm) | 60 - 80 µm |
| Density (g/cm3) | 1.65 - 1.70 g/cm³ |
| Application | Electrostatic |
| Storage | Under dry, cool (≤ 30°C) conditions |
| Shelf life | At least 12 months from production date |
Mechanical Tests
| Flexibility (Cylindrical Mandrel) | ASTM D522-93A |
Pass 3 mm (Primer) Pass 10 mm (System) |
| Adhesion | ASTM D3359-97 (2mm crosshatch) |
Class 0 (Primer) Class 0 (System) |
| Erichsen Cupping | ASTM 643-84 |
Pass 5 mm (Primer) Pass 4 mm (System) |
| Impact | ASTM D2794 |
Pass 0.4 kg·m (Primer) Pass 0.3 kg·m (System) |
Pretreatment
Surface preparation depends upon the metal, the type of surface, its conditions and the required performance.
| Substrate | Mechanical pretreatment | Chemical pretreatment |
| Mild steel | Grit Blasting Sa 2.5 in accordance with ISO NF EN 8501-1. Roughness: Rz 42 84 µm / Ra 6-12 µm | Degreasing & phosphating (or equivalent) followed by passivation, DW rinsing and drying. |
| Cast steel | ||
| Electro Zinc steel | Sweep blasting with a maximum zinc layer thickness reduction of 5 to 10 µm depending on the initial zinc thickness | |
| Hot dip galvanized stee | Degreasing & phosphating / chromating followed by passivation. | |
| flame/electrical deposition) | Grit Blasting Sa 3 in accordance with ISO NF EN 8501-1. Roughness: Rz 42 84 µm / Ra 6-12 µm | Banned |
Environmental & Safety Considerations
Solvent-Free: As a powder coating primer, MT-PZ ALZ44TH contains no solvents, reducing VOC emissions and making it environmentally friendly.
Safe Handling: Wear standard protective equipment (gloves, mask, goggles) when handling powders. Avoid inhalation of dust.
Disposal Guidelines: Unused powder should be recycled or disposed of according to local regulations; do not discharge into waterways.
Performance & Durability Metrics
Corrosion Resistance: Provides cathodic and barrier protection; effective for C3–C4 corrosion categories under ISO 12944 standards when properly over-coated.
Scratch & Mechanical Resistance: Active anticorrosive pigments maintain protection even if the primer is scratched or damaged during handling.
Adhesion: Excellent adhesion to blasted mild steel ensures minimal delamination or flaking over long-term use.
Chemical Resistance: Resistant to mild acids, bases, and industrial pollutants before over-coating; topcoat provides additional protection for aggressive chemicals.
Surface & Substrate Compatibility
Ideal Substrates: Blasted mild steel; recommended for industrial structures, machinery, pipelines, and steel frameworks.
Not Recommended: Cast steel, electro-galvanized steel, hot-dip galvanized steel, or zinc-sprayed surfaces unless otherwise specified.
Substrate Preparation Tips: Ensure surfaces are free from oil, grease, rust, and contamination. Use grit blasting to achieve specified roughness (Rz 35–60 µm / Ra 6–12 µm).
Application Techniques & Tips
Spraying Best Practices: Maintain uniform electrostatic voltage (65–70 kV) and adjust fluidizing/transport air pressure for even coverage.
Film Thickness Control: Over-thick application can lead to incomplete curing; under-thick may reduce corrosion protection.
Over-Coating: Topcoat should be applied after primer curing. Light surface activation may be necessary if the primer surface has aged beyond recommended over-coating window.
Recycling: Combine with at least 70% new powder when reusing; clean spray equipment every 30 minutes to prevent clogging and uneven deposition.
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